定义变量在使用+拼接

定义Sting变量name，int变量age，使用+拼接打印my name is jack.my age is 25

public class A {
    public static void main(String[] args){
        String name = "jack";
        int age = 25;
        System.out.println("my name is " + name + ".my age is " + age);
    }
}

String name = "jack";
int age = 25;

System.out.println("my name is " + name + ". my age is " + age);